]>
Commit | Line | Data |
---|---|---|
320ae51f JA |
1 | #include <linux/kernel.h> |
2 | #include <linux/module.h> | |
3 | #include <linux/backing-dev.h> | |
4 | #include <linux/bio.h> | |
5 | #include <linux/blkdev.h> | |
6 | #include <linux/mm.h> | |
7 | #include <linux/init.h> | |
8 | #include <linux/slab.h> | |
9 | #include <linux/workqueue.h> | |
10 | #include <linux/smp.h> | |
11 | ||
12 | #include <linux/blk-mq.h> | |
13 | #include "blk-mq.h" | |
14 | #include "blk-mq-tag.h" | |
15 | ||
16 | static void blk_mq_sysfs_release(struct kobject *kobj) | |
17 | { | |
18 | } | |
19 | ||
20 | struct blk_mq_ctx_sysfs_entry { | |
21 | struct attribute attr; | |
22 | ssize_t (*show)(struct blk_mq_ctx *, char *); | |
23 | ssize_t (*store)(struct blk_mq_ctx *, const char *, size_t); | |
24 | }; | |
25 | ||
26 | struct blk_mq_hw_ctx_sysfs_entry { | |
27 | struct attribute attr; | |
28 | ssize_t (*show)(struct blk_mq_hw_ctx *, char *); | |
29 | ssize_t (*store)(struct blk_mq_hw_ctx *, const char *, size_t); | |
30 | }; | |
31 | ||
32 | static ssize_t blk_mq_sysfs_show(struct kobject *kobj, struct attribute *attr, | |
33 | char *page) | |
34 | { | |
35 | struct blk_mq_ctx_sysfs_entry *entry; | |
36 | struct blk_mq_ctx *ctx; | |
37 | struct request_queue *q; | |
38 | ssize_t res; | |
39 | ||
40 | entry = container_of(attr, struct blk_mq_ctx_sysfs_entry, attr); | |
41 | ctx = container_of(kobj, struct blk_mq_ctx, kobj); | |
42 | q = ctx->queue; | |
43 | ||
44 | if (!entry->show) | |
45 | return -EIO; | |
46 | ||
47 | res = -ENOENT; | |
48 | mutex_lock(&q->sysfs_lock); | |
49 | if (!blk_queue_dying(q)) | |
50 | res = entry->show(ctx, page); | |
51 | mutex_unlock(&q->sysfs_lock); | |
52 | return res; | |
53 | } | |
54 | ||
55 | static ssize_t blk_mq_sysfs_store(struct kobject *kobj, struct attribute *attr, | |
56 | const char *page, size_t length) | |
57 | { | |
58 | struct blk_mq_ctx_sysfs_entry *entry; | |
59 | struct blk_mq_ctx *ctx; | |
60 | struct request_queue *q; | |
61 | ssize_t res; | |
62 | ||
63 | entry = container_of(attr, struct blk_mq_ctx_sysfs_entry, attr); | |
64 | ctx = container_of(kobj, struct blk_mq_ctx, kobj); | |
65 | q = ctx->queue; | |
66 | ||
67 | if (!entry->store) | |
68 | return -EIO; | |
69 | ||
70 | res = -ENOENT; | |
71 | mutex_lock(&q->sysfs_lock); | |
72 | if (!blk_queue_dying(q)) | |
73 | res = entry->store(ctx, page, length); | |
74 | mutex_unlock(&q->sysfs_lock); | |
75 | return res; | |
76 | } | |
77 | ||
78 | static ssize_t blk_mq_hw_sysfs_show(struct kobject *kobj, | |
79 | struct attribute *attr, char *page) | |
80 | { | |
81 | struct blk_mq_hw_ctx_sysfs_entry *entry; | |
82 | struct blk_mq_hw_ctx *hctx; | |
83 | struct request_queue *q; | |
84 | ssize_t res; | |
85 | ||
86 | entry = container_of(attr, struct blk_mq_hw_ctx_sysfs_entry, attr); | |
87 | hctx = container_of(kobj, struct blk_mq_hw_ctx, kobj); | |
88 | q = hctx->queue; | |
89 | ||
90 | if (!entry->show) | |
91 | return -EIO; | |
92 | ||
93 | res = -ENOENT; | |
94 | mutex_lock(&q->sysfs_lock); | |
95 | if (!blk_queue_dying(q)) | |
96 | res = entry->show(hctx, page); | |
97 | mutex_unlock(&q->sysfs_lock); | |
98 | return res; | |
99 | } | |
100 | ||
101 | static ssize_t blk_mq_hw_sysfs_store(struct kobject *kobj, | |
102 | struct attribute *attr, const char *page, | |
103 | size_t length) | |
104 | { | |
105 | struct blk_mq_hw_ctx_sysfs_entry *entry; | |
106 | struct blk_mq_hw_ctx *hctx; | |
107 | struct request_queue *q; | |
108 | ssize_t res; | |
109 | ||
110 | entry = container_of(attr, struct blk_mq_hw_ctx_sysfs_entry, attr); | |
111 | hctx = container_of(kobj, struct blk_mq_hw_ctx, kobj); | |
112 | q = hctx->queue; | |
113 | ||
114 | if (!entry->store) | |
115 | return -EIO; | |
116 | ||
117 | res = -ENOENT; | |
118 | mutex_lock(&q->sysfs_lock); | |
119 | if (!blk_queue_dying(q)) | |
120 | res = entry->store(hctx, page, length); | |
121 | mutex_unlock(&q->sysfs_lock); | |
122 | return res; | |
123 | } | |
124 | ||
d96b37c0 OS |
125 | static ssize_t blk_mq_hw_sysfs_nr_tags_show(struct blk_mq_hw_ctx *hctx, |
126 | char *page) | |
bd166ef1 | 127 | { |
d96b37c0 | 128 | return sprintf(page, "%u\n", hctx->tags->nr_tags); |
bd166ef1 JA |
129 | } |
130 | ||
d96b37c0 OS |
131 | static ssize_t blk_mq_hw_sysfs_nr_reserved_tags_show(struct blk_mq_hw_ctx *hctx, |
132 | char *page) | |
320ae51f | 133 | { |
d96b37c0 | 134 | return sprintf(page, "%u\n", hctx->tags->nr_reserved_tags); |
320ae51f JA |
135 | } |
136 | ||
676141e4 JA |
137 | static ssize_t blk_mq_hw_sysfs_cpus_show(struct blk_mq_hw_ctx *hctx, char *page) |
138 | { | |
cb2da43e | 139 | unsigned int i, first = 1; |
676141e4 JA |
140 | ssize_t ret = 0; |
141 | ||
cb2da43e | 142 | for_each_cpu(i, hctx->cpumask) { |
676141e4 JA |
143 | if (first) |
144 | ret += sprintf(ret + page, "%u", i); | |
145 | else | |
146 | ret += sprintf(ret + page, ", %u", i); | |
147 | ||
148 | first = 0; | |
149 | } | |
150 | ||
676141e4 JA |
151 | ret += sprintf(ret + page, "\n"); |
152 | return ret; | |
153 | } | |
154 | ||
320ae51f | 155 | static struct attribute *default_ctx_attrs[] = { |
320ae51f JA |
156 | NULL, |
157 | }; | |
158 | ||
d96b37c0 OS |
159 | static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_nr_tags = { |
160 | .attr = {.name = "nr_tags", .mode = S_IRUGO }, | |
161 | .show = blk_mq_hw_sysfs_nr_tags_show, | |
162 | }; | |
163 | static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_nr_reserved_tags = { | |
164 | .attr = {.name = "nr_reserved_tags", .mode = S_IRUGO }, | |
165 | .show = blk_mq_hw_sysfs_nr_reserved_tags_show, | |
166 | }; | |
676141e4 JA |
167 | static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_cpus = { |
168 | .attr = {.name = "cpu_list", .mode = S_IRUGO }, | |
169 | .show = blk_mq_hw_sysfs_cpus_show, | |
170 | }; | |
320ae51f JA |
171 | |
172 | static struct attribute *default_hw_ctx_attrs[] = { | |
d96b37c0 OS |
173 | &blk_mq_hw_sysfs_nr_tags.attr, |
174 | &blk_mq_hw_sysfs_nr_reserved_tags.attr, | |
676141e4 | 175 | &blk_mq_hw_sysfs_cpus.attr, |
320ae51f JA |
176 | NULL, |
177 | }; | |
178 | ||
179 | static const struct sysfs_ops blk_mq_sysfs_ops = { | |
180 | .show = blk_mq_sysfs_show, | |
181 | .store = blk_mq_sysfs_store, | |
182 | }; | |
183 | ||
184 | static const struct sysfs_ops blk_mq_hw_sysfs_ops = { | |
185 | .show = blk_mq_hw_sysfs_show, | |
186 | .store = blk_mq_hw_sysfs_store, | |
187 | }; | |
188 | ||
189 | static struct kobj_type blk_mq_ktype = { | |
190 | .sysfs_ops = &blk_mq_sysfs_ops, | |
191 | .release = blk_mq_sysfs_release, | |
192 | }; | |
193 | ||
194 | static struct kobj_type blk_mq_ctx_ktype = { | |
195 | .sysfs_ops = &blk_mq_sysfs_ops, | |
196 | .default_attrs = default_ctx_attrs, | |
74170118 | 197 | .release = blk_mq_sysfs_release, |
320ae51f JA |
198 | }; |
199 | ||
200 | static struct kobj_type blk_mq_hw_ktype = { | |
201 | .sysfs_ops = &blk_mq_hw_sysfs_ops, | |
202 | .default_attrs = default_hw_ctx_attrs, | |
74170118 | 203 | .release = blk_mq_sysfs_release, |
320ae51f JA |
204 | }; |
205 | ||
ee3c5db0 | 206 | static void blk_mq_unregister_hctx(struct blk_mq_hw_ctx *hctx) |
67aec14c JA |
207 | { |
208 | struct blk_mq_ctx *ctx; | |
209 | int i; | |
210 | ||
4593fdbe | 211 | if (!hctx->nr_ctx) |
67aec14c JA |
212 | return; |
213 | ||
214 | hctx_for_each_ctx(hctx, ctx, i) | |
215 | kobject_del(&ctx->kobj); | |
216 | ||
217 | kobject_del(&hctx->kobj); | |
218 | } | |
219 | ||
ee3c5db0 | 220 | static int blk_mq_register_hctx(struct blk_mq_hw_ctx *hctx) |
67aec14c JA |
221 | { |
222 | struct request_queue *q = hctx->queue; | |
223 | struct blk_mq_ctx *ctx; | |
224 | int i, ret; | |
225 | ||
4593fdbe | 226 | if (!hctx->nr_ctx) |
67aec14c JA |
227 | return 0; |
228 | ||
229 | ret = kobject_add(&hctx->kobj, &q->mq_kobj, "%u", hctx->queue_num); | |
230 | if (ret) | |
231 | return ret; | |
232 | ||
233 | hctx_for_each_ctx(hctx, ctx, i) { | |
234 | ret = kobject_add(&ctx->kobj, &hctx->kobj, "cpu%u", ctx->cpu); | |
235 | if (ret) | |
236 | break; | |
237 | } | |
238 | ||
239 | return ret; | |
240 | } | |
241 | ||
b21d5b30 | 242 | static void __blk_mq_unregister_dev(struct device *dev, struct request_queue *q) |
320ae51f | 243 | { |
85157366 AV |
244 | struct blk_mq_hw_ctx *hctx; |
245 | struct blk_mq_ctx *ctx; | |
246 | int i, j; | |
247 | ||
248 | queue_for_each_hw_ctx(q, hctx, i) { | |
67aec14c JA |
249 | blk_mq_unregister_hctx(hctx); |
250 | ||
251 | hctx_for_each_ctx(hctx, ctx, j) | |
85157366 | 252 | kobject_put(&ctx->kobj); |
67aec14c | 253 | |
85157366 AV |
254 | kobject_put(&hctx->kobj); |
255 | } | |
320ae51f | 256 | |
62ebce16 | 257 | blk_mq_debugfs_unregister_hctxs(q); |
07e4fead | 258 | |
320ae51f JA |
259 | kobject_uevent(&q->mq_kobj, KOBJ_REMOVE); |
260 | kobject_del(&q->mq_kobj); | |
85157366 | 261 | kobject_put(&q->mq_kobj); |
320ae51f | 262 | |
b21d5b30 | 263 | kobject_put(&dev->kobj); |
4593fdbe AM |
264 | |
265 | q->mq_sysfs_init_done = false; | |
c0f3fd2b JA |
266 | } |
267 | ||
b21d5b30 | 268 | void blk_mq_unregister_dev(struct device *dev, struct request_queue *q) |
c0f3fd2b JA |
269 | { |
270 | blk_mq_disable_hotplug(); | |
b21d5b30 | 271 | __blk_mq_unregister_dev(dev, q); |
4593fdbe | 272 | blk_mq_enable_hotplug(); |
320ae51f JA |
273 | } |
274 | ||
868f2f0b KB |
275 | void blk_mq_hctx_kobj_init(struct blk_mq_hw_ctx *hctx) |
276 | { | |
277 | kobject_init(&hctx->kobj, &blk_mq_hw_ktype); | |
278 | } | |
279 | ||
737f98cf | 280 | void blk_mq_sysfs_init(struct request_queue *q) |
67aec14c | 281 | { |
67aec14c | 282 | struct blk_mq_ctx *ctx; |
897bb0c7 | 283 | int cpu; |
67aec14c JA |
284 | |
285 | kobject_init(&q->mq_kobj, &blk_mq_ktype); | |
286 | ||
897bb0c7 TG |
287 | for_each_possible_cpu(cpu) { |
288 | ctx = per_cpu_ptr(q->queue_ctx, cpu); | |
06a41a99 | 289 | kobject_init(&ctx->kobj, &blk_mq_ctx_ktype); |
897bb0c7 | 290 | } |
67aec14c JA |
291 | } |
292 | ||
b21d5b30 | 293 | int blk_mq_register_dev(struct device *dev, struct request_queue *q) |
320ae51f | 294 | { |
320ae51f | 295 | struct blk_mq_hw_ctx *hctx; |
67aec14c | 296 | int ret, i; |
320ae51f | 297 | |
4593fdbe AM |
298 | blk_mq_disable_hotplug(); |
299 | ||
320ae51f JA |
300 | ret = kobject_add(&q->mq_kobj, kobject_get(&dev->kobj), "%s", "mq"); |
301 | if (ret < 0) | |
4593fdbe | 302 | goto out; |
320ae51f JA |
303 | |
304 | kobject_uevent(&q->mq_kobj, KOBJ_ADD); | |
305 | ||
07e4fead OS |
306 | blk_mq_debugfs_register(q, kobject_name(&dev->kobj)); |
307 | ||
320ae51f | 308 | queue_for_each_hw_ctx(q, hctx, i) { |
67aec14c | 309 | ret = blk_mq_register_hctx(hctx); |
320ae51f JA |
310 | if (ret) |
311 | break; | |
320ae51f JA |
312 | } |
313 | ||
4593fdbe | 314 | if (ret) |
b21d5b30 | 315 | __blk_mq_unregister_dev(dev, q); |
4593fdbe AM |
316 | else |
317 | q->mq_sysfs_init_done = true; | |
318 | out: | |
319 | blk_mq_enable_hotplug(); | |
320ae51f | 320 | |
4593fdbe | 321 | return ret; |
320ae51f | 322 | } |
b21d5b30 | 323 | EXPORT_SYMBOL_GPL(blk_mq_register_dev); |
67aec14c JA |
324 | |
325 | void blk_mq_sysfs_unregister(struct request_queue *q) | |
326 | { | |
327 | struct blk_mq_hw_ctx *hctx; | |
328 | int i; | |
329 | ||
4593fdbe AM |
330 | if (!q->mq_sysfs_init_done) |
331 | return; | |
332 | ||
07e4fead OS |
333 | blk_mq_debugfs_unregister_hctxs(q); |
334 | ||
67aec14c JA |
335 | queue_for_each_hw_ctx(q, hctx, i) |
336 | blk_mq_unregister_hctx(hctx); | |
337 | } | |
338 | ||
339 | int blk_mq_sysfs_register(struct request_queue *q) | |
340 | { | |
341 | struct blk_mq_hw_ctx *hctx; | |
342 | int i, ret = 0; | |
343 | ||
4593fdbe AM |
344 | if (!q->mq_sysfs_init_done) |
345 | return ret; | |
346 | ||
07e4fead OS |
347 | blk_mq_debugfs_register_hctxs(q); |
348 | ||
67aec14c JA |
349 | queue_for_each_hw_ctx(q, hctx, i) { |
350 | ret = blk_mq_register_hctx(hctx); | |
351 | if (ret) | |
352 | break; | |
353 | } | |
354 | ||
355 | return ret; | |
356 | } |